ListCallback to complement SideEffect and DataFrame callbacks #568
Related to (PR) #520.
There are times where it's useful for the chunked callback to return a list (that is combined into a single list at the end).
When downstream functions expect
But if there already exist some downstream functions written to deal with
It seems silly to return a single-column data frame, just to then extract that single column later, when we know we'd like have a list in-hand at the end of the chunked reading/processing phase.
Minor suggestion, but certainly not a blocker/bug/etc. (since the work-around is described above).
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